diff --git a/app/src/main/java/org/onosproject/segmentrouting/OsgiPropertyConstants.java b/app/src/main/java/org/onosproject/segmentrouting/OsgiPropertyConstants.java
index 399e95b..7b5a6fc 100644
--- a/app/src/main/java/org/onosproject/segmentrouting/OsgiPropertyConstants.java
+++ b/app/src/main/java/org/onosproject/segmentrouting/OsgiPropertyConstants.java
@@ -41,4 +41,7 @@
     public static final String PROP_PW_TRANSPORT_VLAN = "pwTransportVlan";
     public static final int PW_TRANSPORT_VLAN_DEFAULT = 4090;
 
+    static final String PROP_SYMMETRIC_PROBING = "symmetricProbing";
+    static final boolean SYMMETRIC_PROBING_DEFAULT = false;
+
 }